Been reading up on Green Water - including those in the FAQs. I installed an outdoor water feature about 2 weeks ago - no filteration, just pump. Around 350l, with 5 goldfish. feeding about 2-3 times a day. The water feature gets about 3 hours of direct sunlight a day - the rest of the day it is shaded. Still no green water. What am I doing wrong?

Pump - this is a water feature, so it has a fountain in the middle..... Water change - just added water last weekend

You might want to decrease the amount of water for the time being, coz 3 hrs of sunlight per day is too short and you are also having a low bio load. Once the green water is kick started, you can top up to the normal amount again.Try not to change water for the time being until you see a thin color of green, but do watch your fish closely. The stretched process will stress them.